Lens Focal Length & Field of View Calculator
Field of view for any lens on 30+ sensors — ARRI, RED, Sony, Canon, Blackmagic, full frame, Micro Four Thirds, broadcast and CCTV — plus a reverse mode that finds the focal length you need.
Depth of Field at f/2.8, focus 3 m
Everything from 2.51 m to 3.73 m is acceptably sharp.
Circle of confusion = sensor diagonal ÷ 1500 (0.029 mm here). Standard photographic DOF model.
Frame Line Preview
Scene objects are drawn at true scale (people 1.68–1.75 m, car 4.5 m, table 76 cm) so the frame shows what this lens actually covers at 3 m. Change focal length, sensor or distance and the frame updates live.
Notes:sensor dimensions are the active recording area in each camera's widest mode — crops (anamorphic modes, windowed high-frame-rate, 16:9 vs open gate) shrink the area and narrow the FOV. Calculations assume rectilinear (non-fisheye, non-anamorphic) lenses and use the thin-lens model, which is accurate at normal focus distances. The sensor list is curated and updated as new cameras ship; use Custom for anything not listed.
What Is the Lens Focal Length & Field of View Calculator?
The Lens Focal Length & Field of View Calculator covers far more than one brand: pick from 30+ sensors — ARRI Alexa 35/Mini/LF/65, RED V-Raptor and Komodo, Sony Venice, Burano, FX9/FX6, Canon C500 II and C70, Blackmagic URSA 12K, PYXIS and Pockets, plus full frame, APS-C, Micro Four Thirds, medium format, Super 35 and Super 16 film, 1-inch and broadcast 2/3-inch, smartphone, machine-vision and CCTV formats, or enter any custom sensor size. Enter a focal length and it returns horizontal, vertical and diagonal angles of view, the crop factor and full-frame equivalent focal length, and — given a subject distance — the exact width and height of the scene your frame covers. Flip to Find Focal Length mode and it works backwards, machine-vision style: tell it how wide a scene you need to cover from how far away, and it tells you the lens.
How It Works
Pick your camera or sensor, type a focal length (or tap a common prime), and optionally add a subject distance in meters or feet to see the framed area. In Find Focal Length mode, enter the scene width and camera distance instead.
When to Use It
Use it for location scouting (will a 35mm cover the whole set from the doorway?), lens kit planning across different camera bodies, CCTV and security camera coverage, machine-vision system design, or checking what a lens 'becomes' when you move it between full frame and a crop sensor.
Frequently Asked Questions
- How is field of view calculated?
- AFOV = 2·atan(sensor dimension ÷ 2×focal length) for each axis, and the framed area at a distance is distance × sensor dimension ÷ focal length. This is the standard thin-lens rectilinear model — accurate at normal distances, slightly off in macro range and for fisheye or anamorphic optics.
- Do you keep the sensor list current?
- Yes — the list is curated and updated as new cameras ship. Anything missing works via the Custom option: enter the active sensor area in millimeters from the spec sheet (use the dimensions for your recording mode, since crops and windowed modes change FOV).
- Why does my camera's FOV differ slightly?
- Recording modes matter: 16:9 video often uses less than the sensor's full width, anamorphic modes use different areas, and some lenses breathe (change effective focal length) when focusing close. Use the active area for your actual recording mode.
Last reviewed: 2026-06-27